Injectors

Race Core low-sides are saturated (high-impedance) injector drivers. A typical modern EV14 / LS injector is 12 Ω. That is what you want.

Wiring

• Injector pin A: switched 12 V from the main relay (fused injector rail).
• Injector pin B: ECU low-side. Injector 1 → Low-side 1 (A3), injector 2 → Low-side 2 (A15), and so on.
• You may wire in physical loom order (1–8 down the rail) and set firing order in TunerStudio. You do not have to match cylinder 1 to Low-side 1, but doing so keeps looms readable.

Batch vs sequential

Sequential wants one driver per cylinder and a cam sensor. Semi-sequential / batch can pair injectors (1 with 4, 2 with 3 on a four-cylinder) if you are short on pins — but Race Core has 16 low-sides, so there is rarely a reason. Prefer sequential.

Flyback

The drivers include flyback. Do not add a catch diode across the injector unless a specific module tells you to — a diode across the coil slows closing and fattens the pulse at low PW.